I've noticed that the Windows Event Log Service is causing high CPU usage.
Mostly due to some specific events in the "security" log, such as
"Filtering Platform Connection"
Here is how to disable these from an elevated command prompt:
auditpol /set /subcategory:"Filtering Platform Connection" /success:disable
auditpol /set /subcategory:"Logon" /success:disable
auditpol /set /subcategory:"Logoff" /success:disable
auditpol /set /subcategory:"Other Object Access Events" /success:disable